Why Dogs are Carnivores Not Omnivores

Anatomy experts agree (Feldhamer 2003, NRC 2006, Akers and Denbow 2008) that the dog is a carnivore. On the inside, many facets of the dog's anatomy convince canine nutritionists the dog is a meat-eating carnivore. Some of these features include:

• Hinged-jaw, no sideways movement

• Meat shearing, bone-crunching dental arcade

• No salivary amylase for the digestion of carbohydrates

• Taste receptors geared for meat

• Wide gullet and expandable, acidic stomach

• Short, fast, acidic digestive tract

• Gut flora ill equipped for plant fibre digestion

Their ability to make carbs from protein and fat on a constant cycle and thus zero need of carbohydrates in their diet, the very definition of a meat eater.

Carnivores have sharp jagged teeth which are designed for grabbing, ripping and tearing meat. Carnivores do not posses the flat molars used for grinding vegetation like omnivores do.

Carnivore jaws hinge open widely, allowing them to gulp large chunks of meat and bone. Their powerful jaws and teeth are designed to crush bones. Carnivores cannot chew as they have no lateral movement in their jaws.

Your dog has a very short foregut compared to omnivores and a short smooth hindgut. This allows food to pass through quickly. Omnivores have a much longer intestines because vegetation takes a long time to break down. Dogs do not produce amylase in their saliva. Amylase is an enzyme needed to break down cellulose in plant matter. All herbivores and omnivores produce amylase in their saliva, dogs do not.

Akers, R. M. and Denbow, D. M. (2008). Anatomy and physiology of domestic animals. Oxford: Blackwell.

Corbett, L. (2004). "Dingo". Canids: Foxes, Wolves, Jackals and Dogs. International Union for Conservation of Nature and Natural Resources.

Feldhamer, G. A. (2003). Mammology: Adaptation, diversity, and ecology, 2nd Ed. New York: McGraw-Hill. O’Reece, W. (2004). Dukes’ physiology of domestic animals (12th ed.). Ithaca, NY: Comstock Publishing.

Fleming, F., Corbett, L., Harden, R. and Thomson, P. (2001). Managing the impacts of dingoes and other wild dogs. Canberra, Australia: National Heritage Trust, Bureau of Rural Sciences.

Gill, J., Hoffmannowa, H. and Piekarz, R. (1964). Studies on digestive physiology in the wolf, dingo, and jackal. II. Digestive ability of the pancreas, duodenum and salivary glands and size of the alimentary tract and weight of internal organs. Acta Physiologica, 15(1): 137–148.

National Research Council (NRC) (2006). Nutrient requirement of dogs and cats. Washington, DC: National Academies Press.